Nuprl Lemma : existse-between3_wf 11,40

es:event_system{i:l}, e1,e2:es-E(es), P:({e:es-E(es)| 
es:event_system{i:l}, e1,e2:es-E(es), P:({(loc(e) = loc(e1 Id)  ((es-first(ese)))} 
es:event_system{i:l}, e1,e2:es-E(es), P:(prop{i:l}).
(loc(e2) = loc(e1 Id)  (e(e1,e2].P(e prop{i:l}) 
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DefinitionsP  Q, P  Q, t  T, P  Q, x:AB(x), P  Q, event_system{i:l}, es-E(es), prop{i:l}, es-first(ese), , b, A, loc(e), Id, False, es-locl(esee'), x(s), es-le(esee'), A c B, x:AB(x), e(e1,e2].P(e)
Lemmases-locl wf, es-le wf, es-le-loc, es-loc-pred, Id wf, es-loc wf, not wf, assert wf, es-first wf, es-E wf, event system wf, es-locl-iff

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